The PINE A64 (+) is the first pine64.org Single Board Computer powered by Allwinner’s A64 Quad-Core ARM Cortex A53 64-Bit SOC. There are many Operating Systems available for the PINE A64 (+) created by the open source community and various partner projects. Currently the majority of Linux distributions for the PINE A64 are using mainline Linux but there are a number of BSP-based distribution and / or legacy systems that you can download too.
Apart from Linux, you also have a choice of a selection of *BSDs, Android, Remix OS and Windows IoT.
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We use a special library called adafruit_blinka (named after Blinka, the CircuitPython mascot) to provide the layer that translates the CircuitPython hardware API to whatever library the Linux board provides.
For example, on Raspberry Pi we use the python RPi.GPIO library. For any I2C interfacing we'll use ioctl messages to the /dev/i2c device. For SPI we'll use the spidev python library, etc. These details don't matter so much because they all happen underneath the adafruit_blinka layer.